Tone-arm construction



H. N. sANnELL. TONE ARN CONSTRUCTION.

' APPLICATION FILED JUNE I9. 1920.

,Paten Apr. 26, MN,

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.HENRY R. SANDRLL, or CHICAGO, ILLINOIS, AssICNOR To HERBERT s. MILLS, or y CHICAGO, ILLINOIS. f'

TONE-ARM CONSTRUCTION.

Specification of Letters Patent. Patented A111. 26, 19921,

Application4 filed Jne 19, 1920] serial noz 390,210.

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lie it `known that I, HENRY K. SANDELL, :t citizen of the United States, residing at 221 So. Green street, Chicago, in the /county of Cook and State of Illinois, have invented a Constructions, of'which the followingr is a specification.

' new `and usefulilmprovement in Tone-Arm The present invention relates to improvevspecific embodiment thereof, which is illustrated in the accompanying drawings, in

' which Figure 1 is a plan view ofa tone arm embodying the present lnvention;

'.Flg. 2 1s a plan view` through the tone yarm, partially broken away, in which the section thereof attached to-the sound box i's illustrated `in a different position from thatvillustrated in aFig. 1; f i

Fig. 3 is a side elevation of the tone arm, partially broken away, in the same position as shown in F ig. 1;

Fig. 4 is a longitudinal `sectional yiew through the tone arm on the line 4 of Fig. l, and /7 Fig. 5 is a sectional view Athrough the sound box on the lines 5 of Figs. 1 and Referring more particularly to the drawings, the numeral 10 indicates a tone arm section, preferably tapering in form,l by which the sound waves from the.sound box are .conveyed'to the amplifier and `which is mounted-fory a limited pivotal or lateral movement inthe customary manner (not shown). ,'At itsend this tone arm section is provided with a circular flange 11, which isangularly disposed with reference to vthe axis of the tone arm -section 1 0. In the specific-device illustrated ,in the ldrawing, they plane of the circularterminal fiange 11is at an an le of about 55 to 57 degrees to the axis of the conduit section 10.

QA second conduit section 12,-'to which `the snd box 13 is attached,fis securedl to the tone arm section so as to be -movable relatively thereto in the following manner. The

end by `which saidconduit section 12 is at-v tached to the tone arm section 10 is likewise provided with a circular flangeA 14, which h as lsubstantially the same radius as, the f circular flange 11, and which mates with the .latter when the tone 'arm section 12 is positioned in axial prolongation of the tone arm section 10 as illustrated in Fig. 1 and in sec* tion in Fig. 4. The circular flanges. 11 and 14 are secured in mating relationship with .v

each other by; means of two resilient clamping members 15, 15. or straddle the edges of the mated flanges, and are/secured, preferably byJ screws 16, 16, tothe flange 11. The portlon of these clamps '15, 15 in contact with thev flange *l 14 are provided with resilient or spring eX- These membersfft over tensions 17, .17, which lie against the surfaceof the flange 14 and hold it securely against the flange 11.

that the fiange 14 mayL to the flange 11, While mating relationship 18 and-19 are provided on the flange 14, which, by engagement with the clamp15, 15, determine the limits of movement ofthe flange 14 relative to the flange 11.

The tone arm section 12, carrying the sound box 13, rotates with the flange 14. In one position ofthe tone arm section 12,

determined by engagement of stop 18 ,with f one of clamps 15, the

forms anaxiallprolongatign )of the tone yarm section 10. .'lhls positionof the elementsis It is vthus apparent be'rotated relatively being` maintainedyin therewithl Two stops tone arm section 12 shown in Figs. 1, 3 and 4, and Withthe type of sound boxillistrated, which is specifically describedl in lIny-co ending application Se'- rial No. 309,209 fi ed June 19, 1920, the lateral Wave type of records may he played.

ith this type ofsound box it may be noted that in this positionfthe diaphragm isl at an acute angle to the plane of the record, as is clearly indicatedvinFigs. 3 and 4, and the stylus holder extends from a point -at the y Side of the sound box at right angles to the plane ofthe diaphragm. I On'rotating the tone arm section 12A withthe flange 14 upon the flange'll until the stop 19 engages the other clamping member 15, the relative posi- Ltions'indicated in,F-ig.'2 are. assumed by the parts, the plane of the diaphragm nowbeing perpendicular to the plane of the record, 'In this position the-stylus holder assumes substantially the ,samepositionJ relative to the longitudinal axis of' the tone arm section 10 as in its formerposition, illustrated in Fig. 1.

Although the present invention has been described in connection with the specific details of a device embodying it, it is not in` tended .that'these details shall be regarded as limitations upon the scope of the invention, except in so far as included in the accompanying claims.

AI claim: l; A tone arm comprising a relatively fixed tapered conduit section, a .circular y,

flange secured to its end at an angle to its longitudinal axis, 'a second conduit section having a taper conforming to that of the fixed conduit section, a circular flange secured to the end of said second section, said flange mating with the first mentioned circular flange, and means for retaining said flanges in mating. relationship while permitting relative movement of the second flange with respect to the first flange.

movement 'of the second mentioned flange with respect to the first mentioned flange is permitted.. f

3.I tone arm comprising relatively fixed and relatively movable sections, mating c1rcular flanges terminating said sections,-

clamps securing said flanges to each other, said clamps comprising members straddling the edges of the mating flanges and being secured at one side to the flange on the fixed section and resiliently engaging on the other side the flange on the movable section, Whereby relativemovement of the second 'mentioned flange with respect to the first men- .tioned flange is permitted and lstops on said movable flange to engage said clamps and limit the' relative movements of the movable flange with respect to the fixed flange.

' 4. A tone arm comprising a relatively fixed conduit section, a circular flange secured to its end at an angle of 55 to 57 to its longitudinal axis, a second conduit section, a circular flange secured to the end of second conduit section, said flange mating with the first mentioned circular flange, means for retaining said flangesin mating relationship whileipermitting relative movement of the secondflange with respect to the first flange, a sound box secured to the opposite end of the second section, said lsound box having a stylus holder arranged laterally thereof and project-ingat right angles to the plane of the diaphragm of the sound box, whereby on turning the second section relative to the first mentioned tone arm section, the sound box assumes a new position While the stylus holder retains its relative position with respect to the axis of the fixed tone arm section.

HENRY K. SANDELL. 

